This workflow tests an AHU (air handling unit) for its cooling operation. It verifies the AHU is running, eliminates outside sources of heating and cooling, and then commands cooling to confirm the unit can deliver cooled air.Outcome: This test verifies an AHU’s ability to deliver cooled air when the cooling system is commanded on.
Recommended schedule: Run seasonally (when cooling is first needed) per AHU. Run when there are comfort complaints in a space or floor. Run when AHUs are installed and/or reprogrammed.
Required pre-conditions
- AHU Occupancy Mode is
Occupied
- AHU Duct Pressure exceeds
0.4psi [Pressure Min Threshold]
- AHU Return Air Temperature is below
60°F [RAT Cooling Threshold]
If any of these conditions are not met, the workflow stops and the test is archived.
Workflow overview
1 Pre-Condition Check
- Verify device is
Occupied
- Duct Pressure exceeds
Pressure Min Threshold
- Return Air Temperature below
RAT Cooling Threshold
2 Stop Active Heating
- Success: Discharge Air Temperature is within
10△°F [Heating - Delta] above Mixed Air Temperature
3 Stop Active Cooling
- Success: Discharge Air Temperature is within
10△°F [Cooling - Delta] below Mixed Air Temperature
4 Open Mixed Damper
- Success: Mixed Air Temperature is within
5△°F [Ventilation - Delta] below Return Air Temperature
5 Start Cooling
- Control: Command Cooling to
ON
- Success: Discharge Air Temperature is
10△°F [Cooling - Delta] more than Mixed Air Temperature, or if Mixed Air Temperature is not available, Discharge Air Temperature exceeds 45°F [DAT Arb Cooling Threshold]
Tuning parameters
If you need assistance with interpreting your results, reach out to the support team at support@kodelabs.com.
This workflow will test an AHU (air handling unit) for its heating operation.
- First, we display the initial conditions of the equipment.
- Then, KODE performs pre-condition checks to ensure the equipment is ready to be tested.
- Once confirmed, KODE will stop cooling by commanding the chilled water valve to close fully.
- Then, KODE will stop heating by commanding the steam valve to close fully.
- Finally, we will command the steam valve to fully open to restart heating.
Outcome: This test will check an AHU’s ability to deliver heat when its steam valve is fully opened.
Recommended schedule: Run seasonally (when heating is first needed) per AHU. Run when there are comfort complaints in a space or floor. Run when AHUs are installed and/or reprogrammed.
Required pre-conditions
- AHU Discharge Air Pressure exceeds
AHU Minimum Discharge Air Pressure Threshold
- HHW System Valve exceeds
Minimum HHW System Valve Threshold
Variations: There is a variant of this workflow that works with AHU hot water valves instead of steam valves.Workflow overview
1 Pre-Condition Check
- AHU Discharge Air Pressure exceeds
Discharge Air Pressure Minimum
- HHW System Valve exceeds
HHW Loop Valve Minimum
2 Stop Cooling
- Control: Command AHU chilled water valve to
CHW Valve Close Command
- Success: AHU Discharge Air Temperature ≥ AHU Mixed Air Temperature -
Stop Cooling DAT-MAT Differential
3 Stop Heating
- Control: Command AHU steam valve to
Hot Water Valve Close Command
- Success: AHU Discharge Air Temperature ≤ AHU Mixed Air Temperature +
Stop Heating DAT-MAT Differential
4 Start Heating
- Control: Command AHU steam valve to
Hot Water Valve Open Command
- Success: AHU Discharge Air Temperature ≥ AHU Mixed Air Temperature +
Start Heating DAT-MAT Differential
Tuning parameters
If you need assistance with interpreting your results, reach out to the support team at support@kodelabs.com.
This workflow will test an AHU (air handling unit) for its mixed air damper operation.
- First, we display the initial conditions of the equipment.
- Then, KODE performs pre-condition checks to ensure the equipment is ready to be tested.
- Once confirmed, KODE will open the mixed air damper and route 100% outdoor air to the air-handling unit.
- Finally, KODE will close the mixed air damper and route 100% return air to the air-handling unit.
Outcome: This test evaluates an AHU’s capability to regulate mixed air temperature by modulating the mixed air damper.
Recommended schedule: Run monthly per AHU. Run when there are comfort complaints in a space or floor. Run when AHUs are installed and/or reprogrammed.
Required pre-conditions
- AHU Discharge Air Pressure exceeds
AHU Minimum Discharge Air Pressure Threshold
Variations: There is a variant of this workflow that works with AHU outdoor air dampers instead of mixed air dampers.Workflow overview
1 Pre-Condition Check
- AHU Discharge Air Pressure exceeds
Discharge Air Pressure Minimum
2 Open Mixed Damper
- Control: Command AHU mixed air damper to
Open Mixed Air Damper Command
- Success: AHU Outdoor Air Temperature -
Open MAT-OAT Differential ≤ AHU Mixed Air Temperature ≤ AHU Outdoor Air Temperature + Open MAT-OAT Differential
3 Close Mixed Damper
- Control: Command AHU mixed air damper to
Close Mixed Air Damper Command
- Success: AHU Return Air Temperature -
Close MAT-RAT Differential ≤ AHU Mixed Air Temperature ≤ AHU Return Air Temperature + Close MAT-RAT Differential
Tuning parameters
If you need assistance with interpreting your results, reach out to the support team at support@kodelabs.com.
This workflow tests an AHU (air handling unit) for its variable frequency drive (VFD) operation. It verifies the AHU is running, confirms the unit is maintaining pressure at setpoint, then raises and lowers the duct static pressure setpoint to confirm the VFD responds correctly.Outcome: This test verifies an AHU’s VFD can track duct static pressure setpoint changes in both directions.
Recommended schedule: Run monthly per AHU. Run when there are pressure or airflow complaints. Run when AHU VFDs are installed, replaced, or reprogrammed.
Required pre-conditions
- AHU Occupancy Mode is
Occupied
- AHU Duct Pressure exceeds
0.4psi [Pressure Min Threshold]
- Duct Static Pressure Sensor is within
5% [Relative Tolerance] of setpoint
If any of these conditions are not met, the workflow stops and the test is archived.
Workflow overview
1 Pre-Condition Check
- Verify device is
Occupied
- Duct Pressure exceeds
Pressure Min Threshold
- Duct Static Pressure Sensor within
Relative Tolerance of setpoint
2 Raise Duct Static Setpoint
- Control: Command static pressure setpoint to
Relative Modulation above current setpoint
- Success: Static pressure sensor reads within
Relative Tolerance of new setpoint
3 Lower Duct Static Setpoint
- Control: Command static pressure setpoint to
Relative Modulation below current setpoint
- Success: Static pressure sensor reads within
Relative Tolerance of new setpoint
Tuning parameters
If you need assistance with interpreting your results, reach out to the support team at support@kodelabs.com. 
